Problem 9 · 2015 Math Kangaroo
Medium
Ratios, Rates & Proportions
proportion
It takes Jennifer half an hour to cover half of her journey home from school. How long does it take her to cover the whole journey home?
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Answer: D — 1 hour
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Hint 1 of 2
Half the journey took half an hour, which is 30 minutes.
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Hint 2 of 2
The whole journey is two of those halves.
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Approach: double the time for half the trip
- Half the journey takes half an hour = 30 minutes.
- The whole journey is two equal halves, so it takes 30 + 30 = 60 minutes.
- That is 1 hour, choice D.
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